ci: move workflow to .gitea/workflows so Gitea picks it up

Gitea only scans .gitea/workflows and .github/workflows; it does not scan
.forgejo/workflows (that path is Forgejo-only). The CI was therefore
dormant on a Gitea instance regardless of whether Actions was enabled.
git mv to .gitea/workflows/ (scanned by both Gitea and Forgejo). Updated
the live references in STRUCTURE.md (Gitea + act_runner), AGENT.md, and
today's ROADMAP entry; left the dated historical Shipped entries as the
changelog they are.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/check.yml

@@ -0,0 +1,113 @@
+# Nomarchy CI — eval + lint.
+#
+# Catches the regressions that hurt today:
+#   1. Flake stops evaluating (broken option ref, missing import, etc.).
+#   2. A `nomarchy-*` shell script has a syntax error or a shellcheck
+#      error-severity issue.
+#   3. `docs/SCRIPTS.md` drifts from the repo state because somebody
+#      added / removed / renamed a script and didn't run the generator
+#      (the pre-commit hook handles this, but only when enabled per-clone).
+#   4. An opt-in nomarchy.* toggle stops evaluating. `nix flake check`
+#      only evaluates the four default configs, so a bug that only fires
+#      when a toggle is flipped sails through (e.g. the impermanence
+#      systemd-stage-1 assertion). nomarchy-eval-matrix layers each toggle
+#      onto the default config and forces system.build.toplevel.
+#
+# Doesn't build ISOs — that needs a binary cache. Add a separate job
+# once Cachix/Attic is in place.
+
+name: Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  eval-and-lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
+        with:
+          # Match the runner's effective channel. Nomarchy itself tracks
+          # nixos-25.11 via flake.nix; the installer-action default is fine.
+          extra-conf: |
+            experimental-features = nix-command flakes
+
+      - name: nix flake check --no-build
+        run: nix flake check --no-build
+
+      - name: Evaluate opt-in toggle / palette / home matrix
+        # flake check never flips a nomarchy.* toggle; this does. jq is
+        # provided via nix shell so the step doesn't depend on the runner
+        # image preinstalling it.
+        run: nix shell nixpkgs#jq --command ./bin/utils/nomarchy-eval-matrix
+
+      - name: Lint nomarchy-* scripts (bash -n + shellcheck)
+        run: |
+          # Mirror what .githooks/pre-commit runs locally, but across the
+          # whole tree instead of just changed files. Pre-commit gates
+          # individual commits; CI gates branches (including --no-verify
+          # bypasses).
+          set -e
+          fail=0
+          while IFS= read -r script; do
+            [[ -f "$script" ]] || continue
+            # Python helpers ship under the same nomarchy- prefix
+            # (e.g. nomarchy-haptic-touchpad). Skip non-bash.
+            head -1 "$script" | grep -qE '^#!.*\bbash\b' || continue
+            if ! bash -n "$script"; then
+              echo "::error file=$script::bash syntax error"
+              fail=1
+            fi
+            if ! nix shell nixpkgs#shellcheck --command shellcheck \
+                  --severity=error --shell=bash "$script"; then
+              echo "::error file=$script::shellcheck error-severity issue"
+              fail=1
+            fi
+          done < <(find features/scripts/utils core/system/scripts \
+                        themes/engine/scripts \
+                        -maxdepth 1 -type f -name 'nomarchy-*')
+          exit "$fail"
+
+      - name: docs/SCRIPTS.md is up to date
+        run: |
+          # Regenerate to a temp file and compare. If different, the
+          # contributor forgot to run the generator (or skipped the
+          # pre-commit hook). Fail loudly and tell them the fix.
+          ./bin/utils/nomarchy-docs-scripts --out /tmp/SCRIPTS.regen.md
+          if ! diff -q docs/SCRIPTS.md /tmp/SCRIPTS.regen.md >/dev/null; then
+            echo "::error::docs/SCRIPTS.md is stale."
+            echo "Run: ./bin/utils/nomarchy-docs-scripts --out docs/SCRIPTS.md"
+            echo "Then commit the regenerated file."
+            echo "--- diff ---"
+            diff -u docs/SCRIPTS.md /tmp/SCRIPTS.regen.md || true
+            exit 1
+          fi
+
+      - name: installer/hardware-db.sh references real nixos-hardware modules
+        run: |
+          # Every 4th-pipe-field in HARDWARE_DB is a nixos-hardware module
+          # name. Half the DB used to point at modules that don't exist
+          # (e.g. microsoft-surface-pro-8 — there's only -pro-intel and
+          # -pro-9), which made the install fail at eval time with
+          # cryptic "attribute not found" errors on real laptops. This
+          # step catches that regression class.
+          awk -F'|' '/^  "/ { gsub(/"/,"",$4); gsub(/^[[:space:]]+|[[:space:]]+$/,"",$4); if ($4) print $4 }' \
+            installer/hardware-db.sh | sort -u > /tmp/db-refs.txt
+          nix eval --impure --json --expr '
+            let
+              nh = (builtins.getFlake (toString ./.)).inputs.nixos-hardware.nixosModules;
+            in builtins.attrNames nh' \
+            | nix shell nixpkgs#jq --command jq -r '.[]' | sort -u > /tmp/db-real.txt
+          missing=$(comm -23 /tmp/db-refs.txt /tmp/db-real.txt)
+          if [[ -n "$missing" ]]; then
+            echo "::error::hardware-db.sh references nixos-hardware modules that don't exist:"
+            printf '  - %s\n' $missing
+            echo "Either fix the name (check the actual attr in nixos-hardware) or drop the row."
+            exit 1
+          fi